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由于 GC 检测对象图的孤立孤岛以找到从内存中删除的候选对象,并且 WeakMap 不会用弱引用打破孤岛边界,那么这个引用也不用弱引用打破孤岛边界是WeakMap -> KeyObject有意义的,而引用显然是强的。WeakMap -> Value -> KeyObjectWeakMap -> ValueValue -> KeyObject

例子:

let o = {test:1};
let map = new WeakMap();
map.set(o, {strongRef: o});
o = null; // clear last reference on {test:1}
// will {test:1} be GCed after this ?
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0 回答 0